Question

我找到了这个资源Centering On Canvas。但问题是我不能通过C＃使用相同的东西，因为画布左边和顶部的值返回零并抛出异常。我不会总是通过xaml将元素放在画布上，所以我如何使用C＃来实现它。请帮忙。

<Canvas.Left>
 <MultiBinding Converter="{StaticResource MidValue}"
               ConverterParameter="1">
   <Binding ElementName="cnvMain2"
            Path="ActualWidth" />
   <Binding ElementName="tbSize2"
            Path="ActualWidth" />
 </MultiBinding>
</Canvas.Left>
<Canvas.Top>
 <MultiBinding Converter="{StaticResource MidValue}"
               ConverterParameter="7">
   <Binding ElementName="cnvMain2"
            Path="ActualHeight" />
   <Binding ElementName="tbSize2"
            Path="ActualHeight" />
 </MultiBinding>
</Canvas.Top>

Answer 1

虽然帖子很老，但我刚刚使用了上面的代码，想要分享我的解决方案以防其他人需要它：

public MainWindow()
{
  InitializeComponent();

  this.SizeChanged += new SizeChangedEventHandler(MainWindow_SizeChanged);
}

void MainWindow_SizeChanged(object sender, SizeChangedEventArgs e)
{
  var midValueConverter = new MidValueConverter();

  double left = (double)midValueConverter.Convert(new object[] { cnvMain2.ActualWidth, tbSize2.ActualWidth }, typeof(double), null, Thread.CurrentThread.CurrentCulture);
  Canvas.SetLeft(tbSize2, left);

  double top = (double)midValueConverter.Convert(new object[] { cnvMain2.ActualHeight, tbSize2.ActualHeight }, typeof(double), null, Thread.CurrentThread.CurrentCulture);
  Canvas.SetTop(tbSize2, top);

}

WPF通过代码在画布上居中元素

1 个答案: